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MPSTAT(1)                            Linux User's Manual                           MPSTAT(1)



NAME
       mpstat - Report processors related statistics.

SYNOPSIS
       mpstat  [ -A ] [ -u ] [ -V ] [ -I { SUM | CPU | SCPU | ALL } ] [ -P { cpu [,...] | ON
       | ALL } ] [ interval [ count ] ]

DESCRIPTION
       The mpstat command writes to standard output activities for each available processor,
       processor  0 being the first one.  Global average activities among all processors are
       also reported.  The mpstat command can be used both on SMP and UP  machines,  but  in
       the  latter,  only global average activities will be printed. If no activity has been
       selected, then the default report is the CPU utilization report.

       The interval parameter specifies the amount of time in seconds between  each  report.
       A value of 0 (or no parameters at all) indicates that processors statistics are to be
       reported for the time since system startup (boot).  The count parameter can be speci‐
       fied  in  conjunction with the interval parameter if this one is not set to zero. The
       value of count determines the number of reports generated at interval seconds  apart.
       If  the  interval parameter is specified without the count parameter, the mpstat com‐
       mand generates reports continuously.


OPTIONS
       -A     This option is equivalent to specifying -u -I ALL -P ALL

       -I { SUM | CPU | SCPU | ALL }
              Report interrupts statistics.

              With the SUM keyword, the mpstat command reports the total  number  of  inter‐
              rupts per processor.  The following values are displayed:

              CPU
                     Processor  number. The keyword all indicates that statistics are calcu‐
                     lated as averages among all processors.

              intr/s
                     Show the total number of interrupts received per second by the  CPU  or
                     CPUs.

              With  the  CPU  keyword,  the number of each individual interrupt received per
              second by the CPU or CPUs is displayed.

              With the SCPU keyword,  the  number  of  each  individual  software  interrupt
              received  per  second  by the CPU or CPUs is displayed. This option works only
              with kernels 2.6.31 and later.

              The ALL keyword is equivalent to specifying all the keywords above and  there‐
              fore all the interrupts statistics are displayed.

       -P { cpu [,...] | ON | ALL }
              Indicate the processor number for which statistics are to be reported.  cpu is
              the processor number. Note that processor 0 is the first  processor.   The  ON
              keyword  indicates that statistics are to be reported for every online proces‐
              sor, whereas the ALL keyword indicates that statistics are to be reported  for
              all processors.

       -u     Report CPU utilization. The following values are displayed:

              CPU
                     Processor  number. The keyword all indicates that statistics are calcu‐
                     lated as averages among all processors.

              %usr
                     Show the percentage of CPU utilization that occurred while executing at
                     the user level (application).

              %nice
                     Show the percentage of CPU utilization that occurred while executing at
                     the user level with nice priority.

              %sys
                     Show the percentage of CPU utilization that occurred while executing at
                     the  system  level (kernel). Note that this does not include time spent
                     servicing hardware and software interrupts.

              %iowait
                     Show the percentage of time that the CPU or CPUs were idle during which
                     the system had an outstanding disk I/O request.

              %irq
                     Show  the  percentage of time spent by the CPU or CPUs to service hard‐
                     ware interrupts.

              %soft
                     Show the percentage of time spent by the CPU or CPUs to  service  soft‐
                     ware interrupts.

              %steal
                     Show  the  percentage  of time spent in involuntary wait by the virtual
                     CPU or CPUs while the hypervisor was servicing another virtual  proces‐
                     sor.

              %guest
                     Show  the  percentage of time spent by the CPU or CPUs to run a virtual
                     processor.

              %gnice
                     Show the percentage of time spent by the CPU or CPUs  to  run  a  niced
                     guest.

              %idle
                     Show the percentage of time that the CPU or CPUs were idle and the sys‐
                     tem did not have an outstanding disk I/O request.

              Note: On SMP machines a processor that does not have any activity at all is  a
              disabled (offline) processor.

       -V     Print version number then exit.


ENVIRONMENT
       The mpstat command takes into account the following environment variable:


       S_TIME_FORMAT
              If  this  variable exists and its value is ISO then the current locale will be
              ignored when printing the date in the report header.  The mpstat command  will
              use the ISO 8601 format (YYYY-MM-DD) instead.


EXAMPLES
       mpstat 2 5
              Display  five  reports of global statistics among all processors at two second
              intervals.

       mpstat -P ALL 2 5
              Display five reports of statistics for all processors at two second intervals.


BUGS
       /proc filesystem must be mounted for the mpstat command to work.

       Only a few activities are given by the Linux kernel for each processor.


FILES
       /proc contains various files with system statistics.


AUTHOR
       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO
       sar(1), pidstat(1), iostat(1), vmstat(8)

       http://pagesperso-orange.fr/sebastien.godard/



Linux                                  SEPTEMBER 2012                              MPSTAT(1)